const express = require('express');
const cors = require('cors');
const app = express();
app.use(express.json())
app.use(cors());
app.post('/', (req,res) => {
console.log(req.body);
res.send('received')
})
app.listen(5000, console.log('Server is running on port 5000'));
I am trying to send data to the back-end but always getting undefined
I tried to you a parser but seems like just wrapping void into an object
Posting as answer from my comment.
In the second image in postman you need to change the type dropdown from text to JSON, express.json() only parses the body when the header Content-type is set to "application/JSON" and changing that dropdown will automatically include that header.
Here are the docs if it helps explain why you get the empty object in the second image
On post request from POSTMAN req.body is sending the data but returns { } when submitting the form.
This is what I used as the middleware,
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false}));
but the word bodyParser is marked with the message 'bodyparser is deprecated'.ts(6385),
The declaration was marked as deprecated here.
I tried using,
app.use(express.json());
app.use(express.urlencoded({ extended: false}));
but still its returning { } on req.body
See the coding line when you are registering dependencies, if you register express json, that should be before your route, so it's look like :
const express = require('express');
const app = express();
// middleware registered here
app.use(express.json());
// then your route
app.post('/someroute', async (req,res,next) => {
const { param1, param2 } = req.body;
try {
console.log(`${param1} and ${param2} written in terminal);
res.send('ok');
} catch (err) {
res.send('oopps');
}
})
Are you sure you're using correct headers when you're sending your POST request?
For .json() parsing, your headers should contain: Content-Type: application/json
For urlencoded() form data parsing, your headers should contain: Content-Type: application/x-www-form-urlencoded
Can you also share the CURL of your Postman request?
I'm currently using express to handle a POST request, but when I POST using node-fetch, I send a body and then I console.log() the body received in express (server code). I get an empty object. Not sure why this is happening, I will include my code here below.
Server Code
const express = require('express');
const bodyParser = require("body-parser");
const app = express();
app.use(bodyParser.urlencoded({ extended: true }));
// GET method route
app.get('/api/getHeartCount', function (req, res) {
res.send('GET request')
});
// POST method route
app.post('/api/sendHeart', function (req, res) {
res.sendStatus(200);
let fBody = JSON.stringify(req.body);
console.log("Got body: " + fBody); // When this is run, I get this in the console: Got body: {}
});
app.listen(3000);
POST request code
const fetch = require("node-fetch");
(async () => {
const body = { heartCount: 1 };
const response = await fetch('http://localhost:3000/api/sendHeart', {
method: "post",
body: JSON.stringify(body)
});
const res = await response.text();
console.log(res);
})();
you used the wrong bodyParser
You must use the bodyParser.json() middleware like so in order to be able to parse json and access the body at req.body
// this snippet will enable bodyParser application wide
app.use(bodyParser.json())
// you can also enable bodyParser for a set of routes if you don't need it globally like so
app.post('/..', bodyParser.json())
// or just for a set of routes
router.use(bodyParser.json()
bodyParser.json([options])
Returns middleware that only parses json and only looks at requests where the Content-Type header matches the type option. This parser accepts any Unicode encoding of the body and supports automatic inflation of gzip and deflate encodings.
A new body object containing the parsed data is populated on the request object after the middleware (i.e. req.body).
from : https://www.npmjs.com/package/body-parser#bodyparserjsonoptions
NOTE : don't forget to add the Content-Type: application/json to your requests if you are sending a json type body
UPDATE : as #ifaruki said, express is shipped with a built-in json bodyParser accessible via express.json() from : https://expressjs.com/en/api.html#express.json
You should parse the body of your request
app.use(express.json());
With the newest express version you dont need body-parser
I'm getting this error when I try to send a Base64 string in a POST request.
POST /saveImage 413 10.564 ms - 1459
PayloadTooLargeError: request entity too large
Already tried
--> app.use(bodyParser.urlencoded({ limit: "50mb", extended: true, parameterLimit: 50000 }))
--> app.use(bodyParser.urlencoded({limit: '50mb'}));
--> app.use(bodyParser({limit: '50mb'}));
Here's my code (api.js class)
const express = require('express');
var app = express();
const router = express.Router();
var Connection = require('tedious').Connection
var Request = require('tedious').Request
var TYPES = require('tedious').TYPES
var multer = require('multer');
....
....
....
router.post('/saveImage', (req, res) => {
request=new Request('SAVE_IMAGE',(err, rowCount, rows)=>{
if(err){
console.log(err);
}
});
request.addParameter("Base64Image", TYPES.Text, req.body.IMG)
connection.callProcedure(request);
});
API CALL (Image class contains a Base64 format image and other fields, but I guess the problem occurs because of the Base64 string length. Small images don't cause any trouble)
create(image: Image) {
return this._http.post('/saveImage', image)
.map(data => data.json()).toPromise()
}
I was having the same error. I tried what you tried it did not work.
I guess you are uploading a file. The simple way to solve this is to not set a Content-Type.
my problem was that I was setting on my headers: Content-Type: application/json and I am [was] using multer (expressjs middle for uploading files).
I have the error whenever I try uploading a file.
So when using postman or making such requests using any tools or libraries like axiosjs or fetch() API do not set content-type.
Once you remove the Content-type it will work. That is what I did
on my code, I have:
const express = require('express');
...
const app = express();
app.use(express.json());
...
...And it is working because I removed Content-Type on my postman headers.
Make sure you are not using Content-Type on the headers.
I would recommend you to use express instead of body-parser, as body-parser got merged back in express a long ago.
I am using this code and it seems to work fine, setting the limit option to 200mb, of both express.json and express.urlencoded
app.use(express.json({ limit: "200mb" }));
app.use(express.urlencoded({ extended: true, limit: "200mb" }));
Source: express.json vs bodyparser.json
I have the following Node.js code:
var express = require('express');
var app = express.createServer(express.logger());
app.use(express.bodyParser());
app.post('/', function(request, response) {
response.write(request.body.user);
response.end();
});
Now if I POST something like:
curl -d user=Someone -H Accept:application/json --url http://localhost:5000
I get Someone as expected. Now, what if I want to get the full request body? I tried doing response.write(request.body) but Node.js throws an exception saying "first argument must be a string or Buffer" then goes to an "infinite loop" with an exception that says "Can't set headers after they are sent."; this also true even if I did var reqBody = request.body; and then writing response.write(reqBody).
What's the issue here?
Also, can I just get the raw request without using express.bodyParser()?
Starting from express v4.16 there is no need to require any additional modules, just use the built-in JSON middleware:
app.use(express.json())
Like this:
const express = require('express')
app.use(express.json()) // <==== parse request body as JSON
app.listen(8080)
app.post('/test', (req, res) => {
res.json({requestBody: req.body}) // <==== req.body will be a parsed JSON object
})
Note - body-parser, on which this depends, is already included with express.
Also don't forget to send the header Content-Type: application/json
Express 4.0 and above:
$ npm install --save body-parser
And then in your node app:
const bodyParser = require('body-parser');
app.use(bodyParser);
Express 3.0 and below:
Try passing this in your cURL call:
--header "Content-Type: application/json"
and making sure your data is in JSON format:
{"user":"someone"}
Also, you can use console.dir in your node.js code to see the data inside the object as in the following example:
var express = require('express');
var app = express.createServer();
app.use(express.bodyParser());
app.post('/', function(req, res){
console.dir(req.body);
res.send("test");
});
app.listen(3000);
This other question might also help: How to receive JSON in express node.js POST request?
If you don't want to use the bodyParser check out this other question: https://stackoverflow.com/a/9920700/446681
As of Express 4, the following code appears to do the trick.
Note that you'll need to install body-parser using npm.
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.listen(8888);
app.post('/update', function(req, res) {
console.log(req.body); // the posted data
});
For 2019, you don't need to install body-parser.
You can use:
var express = require('express');
var app = express();
app.use(express.json())
app.use(express.urlencoded({extended: true}))
app.listen(8888);
app.post('/update', function(req, res) {
console.log(req.body); // the posted data
});
You should not use body-parser it is deprecated. Try this instead
const express = require('express')
const app = express()
app.use(express.json()) //Notice express.json middleware
The app.use() function is used to mount the specified middleware function(s) at the path which is being specified. It is mostly used to set up middleware for your application.
Now to access the body just do the following
app.post('/', (req, res) => {
console.log(req.body)
})
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json())
var port = 9000;
app.post('/post/data', function(req, res) {
console.log('receiving data...');
console.log('body is ',req.body);
res.send(req.body);
});
// start the server
app.listen(port);
console.log('Server started! At http://localhost:' + port);
This will help you. I assume you are sending body in json.
This can be achieved without body-parser dependency as well, listen to request:data and request:end and return the response on end of request, refer below code sample. ref:https://nodejs.org/en/docs/guides/anatomy-of-an-http-transaction/#request-body
var express = require('express');
var app = express.createServer(express.logger());
app.post('/', function(request, response) {
// push the data to body
var body = [];
request.on('data', (chunk) => {
body.push(chunk);
}).on('end', () => {
// on end of data, perform necessary action
body = Buffer.concat(body).toString();
response.write(request.body.user);
response.end();
});
});
In my case, I was missing to set the header:
"Content-Type: application/json"
Try this:
response.write(JSON.stringify(request.body));
That will take the object which bodyParser has created for you and turn it back into a string and write it to the response. If you want the exact request body (with the same whitespace, etc), you will need data and end listeners attached to the request before and build up the string chunk by chunk as you can see in the json parsing source code from connect.
The accepted answer only works for a body that is compatible with the JSON format. In general, the body can be accessed using
app.use(
Express.raw({
inflate: true,
limit: '50mb',
type: () => true, // this matches all content types
})
);
like posted here. The req.body has a Buffer type and can be converted into the desired format.
For example into a string via:
let body = req.body.toString()
Or into JSON via:
let body = req.body.toJSON();
If you're lazy enough to read chunks of post data.
you could simply paste below lines
to read json.
Below is for TypeScript similar can be done for JS as well.
app.ts
import bodyParser from "body-parser";
// support application/json type post data
this.app.use(bodyParser.json());
// support application/x-www-form-urlencoded post data
this.app.use(bodyParser.urlencoded({ extended: false }));
In one of your any controller which receives POST call use as shown below
userController.ts
public async POSTUser(_req: Request, _res: Response) {
try {
const onRecord = <UserModel>_req.body;
/* Your business logic */
_res.status(201).send("User Created");
}
else{
_res.status(500).send("Server error");
}
};
_req.body should be parsing you json data into your TS Model.
I'm absolutely new to JS and ES, but what seems to work for me is just this:
JSON.stringify(req.body)
Let me know if there's anything wrong with it!
Install Body Parser by below command
$ npm install --save body-parser
Configure Body Parser
const bodyParser = require('body-parser');
app.use(bodyParser);
app.use(bodyParser.json()); //Make sure u have added this line
app.use(bodyParser.urlencoded({ extended: false }));
What you claim to have "tried doing" is exactly what you wrote in the code that works "as expected" when you invoke it with curl.
The error you're getting doesn't appear to be related to any of the code you've shown us.
If you want to get the raw request, set handlers on request for the data and end events (and, of course, remove any invocations of express.bodyParser()). Note that the data events will occur in chunks, and that unless you set an encoding for the data event those chunks will be buffers, not strings.
You use the following code to log post data:
router.post("/users",function(req,res){
res.send(JSON.stringify(req.body, null, 4));
});